Boiler construction



May 29, 1923.

, E. KIDWELL BOILER' CONSTRUCTION Filled Oct. 12, 1920 Patented May 29, 1923. A

UNITED STATES PATENT OFFlCE.

EDGAR XIDWELL, F MILWAUKEE, WISCONSIN, oASSIGNIIL T KIDWELL BILEB COMPANY, OF HILWAUKEEfWISCONSm, A. CORPORATION 0F WISCONSIN.l

norms. coNsrnUor'IoN.

' Application med October 12, 1920. Serial No. 416,898.-

Toallwhmntmayaoncem;

Be it known that I, EDGAR KInwELL, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin,l have in-` vented certain new and useful Improvements in Boiler Constructions, of which rivets and the. adjacent housing wall.

the following is a specification.

This invention relates to boilers of the series drum and tube type wherein the water circulating path is constituted by a series of transverse drums and connecting water tubes, one or more of said drums having its or their heads yieldingly pos1- tioned within an opening in the wall of the setting in such a manner as to permit limited bodily movement of the drum or drums in order to compensate for the variable expansion of the tubes. Such movement may be as great vas 5 of an inch, and therefore there must be a corresponding clear space left between the boiler hea has heretofore been the practice to pack the s ace with asbestos rope in order to prevent the leakage of air into the setting, but owing to the bodily working of the drum the packing material is crushed to one side and released. The resultin leakage of air materially impairs the e .cient operation of the boiler, for the reason that such air seriously reduces the draft and minimizes the percentage of CO2 in the gaseous products of combustion, thus causlng a serious fuel waste. I

The object of m mventlon 1s to remedy the objection mentioned, and tothat end I provide a novel construction and organization of parts whereby a reliable joint or connection is established between a drum and the setting of the boiler as will be hereinafter described and claimed.

In the drawings- Figure 1 is a transverse section, artly in plan, of a portion of the wall of a oiler setting with one end of a drum positioned therein, showing my improved joint construction.

Fig. 2 is a front view, partly in section, of the structure .shown inFig. 1.

Figs. 3 and 4 are perspective views of single bricks which are use in constructing the packing supporting rings f o f the-fsettin eferring the drawings, 5 designates one end of a suspended boiler drum, and 6 a portion of the setting wall having a circular opening #within which such end, -includin the riveted drum head 7, is loosel entere and is therein surrounded by ac ing. In

pursuance of myinvention in its preferred'- form I construct this openingby means of 'inner and outer rings of bricks 8, 9, respecdrum due to the expansionof the water tubes. The inner ring of bricks 8 is of` greater diameter than the boiler drum, so as to' afford the requisite clearance for the latter. its inner face with a groove, 10, of such character that when the ring is constructed it presents an annular groove in close relation to the circular series of rivet heads 11. VThis groove enables the bricks 8 to be placed with a minimum clearance, about of an inch, between them andthe adjacent rivet heads. A ring 12 bf asbestos ro e packing is placed between the rivet hea and thev outer edge of the groove in the ring of bricks 8 so as to fill the intervening space, and in front of this ro is well packed dry fibrous asbestos 13. i done the outer ring of bricks 9 is installe the same being of less internal diameter than theinner ring of bricks 8 as shown.

.The bricks 9 are tapered on their inner ends, as at 14, -topresent an inclined surface spaced from the opposing face .of- .the drum head. The clearance thus afforded between the inclined surface' 14 and the drum l'head is preferably about S of an inch. When the ring of bricks 9 has, been installed, more dry asbestos is'packed in,-`i,and then two rin of asbestos rope, as 15, are a plied toot e space betweeny the 'ring of bric boiler head and therein tiglitly caulked. By the construction just -described the drum has capacity for. ample backward and forward movement at right angles toithe longitudinal axis of the drum-and, by means of the groove in the bricks 8 in conjunction.

with the described disposition of the asbestos ropes, the packing is most eiectually locked in place and a tight and reliable joint is ensured; that to say,fthe rivet heads,

Each of the bricks 8 is formed in I 9 and the acts as a continuous seal to prevent the packing 13 from shifting into the spaces bey tween and surrounding the rivet heads.

The outer ropes are caulked in place to prevent the packing 13 falling outward.

Without limiting myself to the precise -details rof construction disclosed, what 'l l. A boiler having a setting with an opening in the wall thereof, and a drum having its head and a portion of its cylindrical shell loosely entered in the opening, said opening` being formed by a 'ring structure built into 'the setting and presenting two internal face ing, inner and outer rings built into the setting to constitute the opening to receive the head of the drum, the inner ring being of greater diameter than the drum and 'having an internal groove in proximity to the Lawaai rivets of the drum head, and the outer ring being of less internal diameter than the inner 'ring and having an inclined surface in spaced relation to the outer face of the drum head, and packing material disposed between thel rivet heads and the outer portion of the groove and also in the space between the boiler head and the two rings.

3. in a boiler havin a setting with an opening in the wall t ereof, and a drum having its head loosely entered in said opening, inner and outer rings of bricks built into the wallof the setting to constitute the opening to receive the head of the drum, the

inner ring being of greater diameter them-w the drum and having an internal groove in proximity to the drum head, and the outer ring being ot less internal diameter than the inner rin and having an inclined surface in spaced relation to the outer face of the drum head, a packing rope disposed between the rivet heads and the outer edge of the groove, loose fibrous material packed between the two rings and the proximate portions of the drum, and a rope or ropes packed between the outer ring and the'face of the drum head. A

signed at Milwaukee, in the county of Waukee and State of Wisconsin, this 8th day of October A. D. 1920.

EDGAR KDWELL. l 

